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We have a total of 10 ROBICON Perfect Harmony gene. IV, manufactured in Germany in 2010. (6100v; 355A) model 6SR3102-5FJ44-0BGO-Z.

Every time we open the 6 Kv switch for some maintenance we have trouble closing it again. The VDF before sending the closing order to the GCB is without alarms. When we send the order to close the switch this closes and reopens by an order of the VDF itself, (the protection of the GCB does not make the shot). At the second or third attempt to close the switch is closed, but this operation is good for the teams and we need to solve it.

Do you have a copy of the drive system operating program (SOP)? There may be some logic written in the SOP around the interface between the drive and the upstream breaker. Also check the status of the latch fault relay LFR before attempting to close the upstream breaker. It never hurts to turn the LRF reset key switch to ensure the LFR is not in a latched state.